How to make From date later than To date

[vintoICT]

I have 2 date fields for when a candidate got a degree . One is DATE FROM AND THE OTHER IS DATE T0
I want a warning or pop if to date is later than from date. eg if FROM date is 12/2/1990 to date can not be 10/1/1989 .

[mobhar]

You may simply use Row_Inserting and/or Row_Updating server event, for example:

if (strtotime($rsnew["DateFrom"]) > strtotime($rsnew["DateTo"])) {
    $this->setFailureMessage("<strong>Date From</strong> cannot be greater than <strong>Date To</strong>.");
    return false;
}

[vintoICT]

got this error in php 8.2
PHP Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated

[mobhar]

You may improve the code by checking whether the value is empty (null) or not:

if (!empty($rsnew["DateFrom"]) && !empty($rsnew["DateTo"])) {
  if (strtotime($rsnew["DateFrom"]) > strtotime($rsnew["DateTo"])) {
    $this->setFailureMessage("<strong>Date From</strong> cannot be greater than <strong>Date To</strong>.");
    return false;
  }
}